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Open Mathematics > 2014 > 12 > 6 > 896-910
Open Mathematics > 2013 > 11 > 10 > 1774-1784
Open Mathematics > 2013 > 11 > 1 > 170-176
Open Mathematics > 2014 > 12 > 6 > 896-910
Open Mathematics > 2013 > 11 > 10 > 1774-1784
Open Mathematics > 2013 > 11 > 1 > 170-176